In addition I have a DT770/80, Amiron Home, DT1990 and A20 amp. The issue is that when a single bit needs to be rewritten, the ENTIRE shingle sector must be written (yes, Im simplifying the tech a little intentionally). Im impressed. I ordered 1 size up as suggested and they fit perfectly! In winter. I have plantar fasciitis and a heel spur in my right heel. Too small for the size Overall my experience with the product is positive, now that Ive dealt with the driver issues. I knew it was too go to be true. It should hold earbuds in, but I haven?t used it too many times.